I have recently acquired a second hand Coronado PST and, wanting to image with my ASI224MC, have had to use the Barlow lens trick (ie without the barrel) to get focus, which means that I cannot get the whole disc in at once.

The low profile nosepiece replaces the whole front of the camera (the red bit). Initially I was unsure how to get the front off - in fact it just unscrews. Wrap en elastic band round the 'barrel' of the front plate and try not to squeeze too hard when you twist and it comes off easily. The protective glass screen over the sensor just sits on top of the sensor so make sure you don't lose it when you take the front plate off. The new low profile adaptor just screws on its place. It comes with a gasket which you can fit if the screen wobbles but mine was fine without.

Its nicely made, though not quite up to ZWO standards and, although not as pretty as the shiny red, looks fine when fitted. I could easily get focus - and can just about get the whole disc in with my setup but, if the image drifts at all during imaging, I lose a bit.

Drops a star as, inexplicably, the nosepiece is not threaded to accept filters - its just 'baffled' - which is baffling. I didn't want to have to swap back the original each time I wanted to use the camera with filters for planetary on my main telescope but will have to. Maybe a v2 will come along.